#include "project.h"


static volatile uint32_t delay_ms_count;
volatile uint32_t ticks;
static uint32_t scale=10;

void
delay_us (uint32_t d)
{
  d *= scale;
  while (d--)
    {
      __asm__ ("nop");
    }
}

void
sys_tick_handler (void)
{
  if (delay_ms_count)
    delay_ms_count--;

  ticks++;
}



void
delay_ms (uint32_t d)
{
  delay_ms_count = d;
  while (delay_ms_count);
}

int  timed_out(uint32_t then,unsigned int ms)
{
then=ticks-then;

if (then>ms) return 1;
return 0;
}


void ticker_init(void)
{
  uint32_t v,w;

  /*Start periodic timer*/

  systick_set_clocksource (STK_CSR_CLKSOURCE_AHB_DIV8);
  /* 48MHz / 8 = > 6Mhz */
  systick_set_reload (6000);
  /* 6MHz / 6000 => 1kHz */
  systick_interrupt_enable ();
  systick_counter_enable ();

  /*Calibrate the delay loop */


  do
    {
      scale--;
      v = ticks;
      while (v == ticks);
      delay_us (1000);
      w = ticks;
      v++;
      w -= v;
    }
  while (w);


}